Effects of different land-use patterns on soil active organic carbon in Stipa baicalensis steppe in Inner Mongolia

doi:10.11686/cyxb2020477

Abstract

Abstract:

Soil active organic carbon can accurately reflect soil nutrient availability and characterize changes in soil quality. It is one of the key indicators for research into sustainable grassland management measures. Here we report a field experiment carried out on Stipa baicalensis steppe in Inner Mongolia， in which grazing， grazing exclusion （i.e. enclosure） and mowing treatments were used to explore the effects of the different land use patterns on soil organic carbon （SOC） and active organic carbon. It was found that SOC content， soil microbial biomass carbon （MBC） content and soil readily oxidizable organic carbon （ROC） content under the different land use patterns all ranked： grazing exclusion>mowing>grazing. The ranking for soil dissolved organic carbon （DOC） content was grazing>exclusion>mowing. There was a very significant correlation between soil MBC， ROC and SOC （P<0.01）. Soil ROC and MBC were significantly correlated with total nitrogen and total phosphorus （P<0.01）. Grazing exclusion and mowing promoted the improvement of soil SOC， MBC and ROC， and grazing had an accumulative effect on DOC. Grazing exclusion and mowing enhanced the stability of soil SOC. Active organic carbon was closely related to soil organic carbon and soil physical and chemical properties and sensitively reflected changes in the level of soil organic carbon.

Key words: soil active organic carbon, enclosure, grazing, mowing, Stipa baicalensis steppe

Jia-qiang JING, Ren-qi-li-mo-ge SA, Jie QIN, Hai-fang ZHANG, Ming LI, Dian-lin YANG. Effects of different land-use patterns on soil active organic carbon in Stipa baicalensis steppe in Inner Mongolia[J]. Acta Prataculturae Sinica, 2022, 31(1): 47-56.

Figures/Tables 6

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指标Index	易氧化有机碳ROC	微生物生物量碳MBC	土壤有机碳SOC	pH	全氮TN	全磷TP
可溶性有机碳DOC	-0.20	-0.32	-0.25	-0.30	-0.24	-0.08
易氧化有机碳ROC		0.92**	0.95**	-0.24	0.95**	0.58**
微生物生物量碳MBC			0.90**	-0.08	0.89**	0.51**

指标Index	易氧化有机碳ROC	微生物生物量碳MBC	土壤有机碳SOC	pH	全氮TN	全磷TP
可溶性有机碳DOC	-0.20	-0.32	-0.25	-0.30	-0.24	-0.08
易氧化有机碳ROC		0.92**	0.95**	-0.24	0.95**	0.58**
微生物生物量碳MBC			0.90**	-0.08	0.89**	0.51**

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